Hello! Thank you for your answers.
Is there an active class tool in the SIM?
You can set a class as active using Properties dialog.
Right-click on a class, choose Properties from the context menu and check 'Active' check box in Modifiers group on General tab.
Thanks. But picture of class didn't change!
Actually, the border of class will become double width. I reviewed this notation and I found out that it does not conform to UML specification. It will be fixed in the next release. Thank you for your notice.
Visual of active classes fixed in version 7.70.